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/*
* Makes it easy to support "ensembles". i.e. commands with subcommands
* like [string] and [array]
*
* (c) 2008 Steve Bennett <steveb@workware.net.au>
*
*/
#include <stdio.h>
#include <string.h>
#include <jim-subcmd.h>
/**
* Implements the common 'commands' subcommand
*/
static int subcmd_null(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
/* Nothing to do, since the result has already been created */
return JIM_OK;
}
/**
* Do-nothing command to support -commands and -usage
*/
static const jim_subcmd_type dummy_subcmd = {
"dummy", NULL, subcmd_null, 0, 0, JIM_MODFLAG_HIDDEN
};
static void add_commands(Jim_Interp *interp, const jim_subcmd_type * ct, const char *sep)
{
const char *s = "";
for (; ct->cmd; ct++) {
if (!(ct->flags & JIM_MODFLAG_HIDDEN)) {
Jim_AppendStrings(interp, Jim_GetResult(interp), s, ct->cmd, NULL);
s = sep;
}
}
}
static void bad_subcmd(Jim_Interp *interp, const jim_subcmd_type * command_table, const char *type,
Jim_Obj *cmd, Jim_Obj *subcmd)
{
Jim_SetResultFormatted(interp, "%#s, %s command \"%#s\": should be ", cmd, type, subcmd);
add_commands(interp, command_table, ", ");
}
static void show_cmd_usage(Jim_Interp *interp, const jim_subcmd_type * command_table, int argc,
Jim_Obj *const *argv)
{
Jim_SetResultFormatted(interp, "Usage: \"%#s command ... \", where command is one of: ", argv[0]);
add_commands(interp, command_table, ", ");
}
static void add_cmd_usage(Jim_Interp *interp, const jim_subcmd_type * ct, Jim_Obj *cmd)
{
if (cmd) {
Jim_AppendStrings(interp, Jim_GetResult(interp), Jim_String(cmd), " ", NULL);
}
Jim_AppendStrings(interp, Jim_GetResult(interp), ct->cmd, NULL);
if (ct->args && *ct->args) {
Jim_AppendStrings(interp, Jim_GetResult(interp), " ", ct->args, NULL);
}
}
static void set_wrong_args(Jim_Interp *interp, const jim_subcmd_type * command_table, Jim_Obj *subcmd)
{
Jim_SetResultString(interp, "wrong # args: should be \"", -1);
add_cmd_usage(interp, command_table, subcmd);
Jim_AppendStrings(interp, Jim_GetResult(interp), "\"", NULL);
}
/* internal rep is stored in ptrIntvalue
* ptr = command_table
* int1 = index
*/
static const Jim_ObjType subcmdLookupObjType = {
"subcmd-lookup",
NULL,
NULL,
NULL,
JIM_TYPE_REFERENCES
};
const jim_subcmd_type *Jim_ParseSubCmd(Jim_Interp *interp, const jim_subcmd_type * command_table,
int argc, Jim_Obj *const *argv)
{
const jim_subcmd_type *ct;
const jim_subcmd_type *partial = 0;
int cmdlen;
Jim_Obj *cmd;
const char *cmdstr;
int help = 0;
if (argc < 2) {
Jim_SetResultFormatted(interp, "wrong # args: should be \"%#s command ...\"\n"
"Use \"%#s -help ?command?\" for help", argv[0], argv[0]);
return 0;
}
cmd = argv[1];
/* Use cached lookup if possible */
if (cmd->typePtr == &subcmdLookupObjType) {
if (cmd->internalRep.ptrIntValue.ptr == command_table) {
ct = command_table + cmd->internalRep.ptrIntValue.int1;
goto found;
}
}
/* Check for the help command */
if (Jim_CompareStringImmediate(interp, cmd, "-help")) {
if (argc == 2) {
/* Usage for the command, not the subcommand */
show_cmd_usage(interp, command_table, argc, argv);
return &dummy_subcmd;
}
help = 1;
/* Skip the 'help' command */
cmd = argv[2];
}
/* Check for special builtin '-commands' command first */
if (Jim_CompareStringImmediate(interp, cmd, "-commands")) {
/* Build the result here */
Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
add_commands(interp, command_table, " ");
return &dummy_subcmd;
}
cmdstr = Jim_GetString(cmd, &cmdlen);
for (ct = command_table; ct->cmd; ct++) {
if (Jim_CompareStringImmediate(interp, cmd, ct->cmd)) {
/* Found an exact match */
break;
}
if (strncmp(cmdstr, ct->cmd, cmdlen) == 0) {
if (partial) {
/* Ambiguous */
if (help) {
/* Just show the top level help here */
show_cmd_usage(interp, command_table, argc, argv);
return &dummy_subcmd;
}
bad_subcmd(interp, command_table, "ambiguous", argv[0], argv[1 + help]);
return 0;
}
partial = ct;
}
continue;
}
/* If we had an unambiguous partial match */
if (partial && !ct->cmd) {
ct = partial;
}
if (!ct->cmd) {
/* No matching command */
if (help) {
/* Just show the top level help here */
show_cmd_usage(interp, command_table, argc, argv);
return &dummy_subcmd;
}
bad_subcmd(interp, command_table, "unknown", argv[0], argv[1 + help]);
return 0;
}
if (help) {
Jim_SetResultString(interp, "Usage: ", -1);
/* subcmd */
add_cmd_usage(interp, ct, argv[0]);
return &dummy_subcmd;
}
/* Cache the result for a successful non-help lookup */
Jim_FreeIntRep(interp, cmd);
cmd->typePtr = &subcmdLookupObjType;
cmd->internalRep.ptrIntValue.ptr = (void *)command_table;
cmd->internalRep.ptrIntValue.int1 = ct - command_table;
found:
/* Check the number of args */
if (argc - 2 < ct->minargs || (ct->maxargs >= 0 && argc - 2 > ct->maxargs)) {
Jim_SetResultString(interp, "wrong # args: should be \"", -1);
/* subcmd */
add_cmd_usage(interp, ct, argv[0]);
Jim_AppendStrings(interp, Jim_GetResult(interp), "\"", NULL);
return 0;
}
/* Good command */
return ct;
}
int Jim_CallSubCmd(Jim_Interp *interp, const jim_subcmd_type * ct, int argc, Jim_Obj *const *argv)
{
int ret = JIM_ERR;
if (ct) {
if (ct->flags & JIM_MODFLAG_FULLARGV) {
ret = ct->function(interp, argc, argv);
}
else {
ret = ct->function(interp, argc - 2, argv + 2);
}
if (ret < 0) {
set_wrong_args(interp, ct, argv[0]);
ret = JIM_ERR;
}
}
return ret;
}
int Jim_SubCmdProc(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
const jim_subcmd_type *ct =
Jim_ParseSubCmd(interp, (const jim_subcmd_type *)Jim_CmdPrivData(interp), argc, argv);
return Jim_CallSubCmd(interp, ct, argc, argv);
}
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